Widely used in chemical, food, pharmaceutical, electroplating, paper making, environmental protection, water treatment and other departments, transportation acid, alkali, salt and other corrosive fluids, the use of long-term practice, welcomed by all users = widely used in chemical, food, pharmaceutical, electroplating, paper making, environmental protection, water treatment and other departments, transportation acid, alkali, salt and other corrosive fluids, the use of long-term practice, welcomed by all users